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Procedure Preparation Resources

Preparation is essential to make sure your procedure goes smoothly. Below are instructions for our most common procedures, with specific instructions depending on what medication you're using. Please follow your instructions carefully to ensure that we can best provide for your care. As always, please don't hesitate to call our office at (925) 384-9276 or reach us by email at with any questions or concerns that you have. 

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Procedure Preparation Instructions

Each set of preparation instructions is designed for a specific procedure and specific medication. Make sure you select the correct file. 


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Blood Thinners

7 Days Prior To Your Procedure:  

Stop taking all anti-platelet medications: Plavix (clopidogrel), Pletal, Aggrenox, Agrylin (anagrelide), or Effient. Ticlid (ticlopidine needs to be stopped 10-14 days)

5-7 Days Prior To Your Procedure:

Stop all NSAIDs  (ibuprofen, Advil, Aleve, Motrin, naproxen, diclofenac, celecoxib, mefenamic acid, etoricoxib, indomethacin, etc)

Aspirin, if used for prevention, should be stopped 5-7 days prior to procedure.

If you take Aspirin because you have history of stroke or/and heart attack, please check with Dr. Zheng regarding staying on Aspirin during your pre procedure visit


5 Days Prior To Your Procedure:  

Stop taking Coumadin (warfarin), Jantoven 


2 Days Prior To Your Procedure:  

Stop taking Pradaxa (dabigatran), Xarelto (rivaroxaban), Eliquis (apixaban), longer if you have renal insufficiency (Kidney issues, please check with Dr. Zheng during your pre procedure visit)


12 hours Prior To Your Procedure:  

Stop taking Lovenox 


If your PCP and/or specialist (ie cardiologist, neurologist) request you have to stay on blood thinner, please alert Dr. Zheng during pre procedure visit.







Dr. Zheng will advise you when you can restart blood thinner after your procedure







If you take heart, blood pressure, or seizure medication routinely, you may take the medication up to 3 hours before your procedure with a small amount of water. 


If you are diabetic, hold oral medications the morning of your procedure. If you take insulin, take only half of your normal dose depending on your morning glucose level. 

Ask your DM specialist or PCP if you have type 1 diabetes wearing an insulin pump or have any questions regarding your DM medication.

Vitamins and pills

Other Essential Medications

Daily Pills
Intensive Diabetic Care For Patients wit

General Infomation

Preparing for your colonoscopy

Learn what you need to do to prepare for your colonoscopy:

  • Five to Seven days before your colonoscopy, eat only low-fiber foods.  Also, stop taking any fiber supplements or anti-diarrheal medication.

  • Two days before, continue eating only low-fiber foods.

  • One day before, go on a clear-liquid diet.

  • The evening before, drink half of a prescription laxative drink to clean out your colon for the procedure. (You'll finish it the next morning.)

Important: Arrange for someone to drive you home after the colonoscopy. Your test will have to be rescheduled if you don't have someone to accompany you home.

If you need to cancel your procedure, you must cancel 5 business days (1 week) in advance to avoid a $100 late cancellation fee.

Three days before your procedure

Start preparing three days before your colonoscopy. For example, if your colonoscopy is scheduled for Wednesday, you would start the low-fiber diet Sunday morning.

  • Stop taking any fiber supplements and anti-diarrheal medication.

  • Eat only low-fiber foods, and avoid foods with certain dyes that may interfere with the test.

Low-fiber food chart

Confirm that a family member or friend is available to drive you home after your procedure and to stay with you for two hours afterward.

Two days before procedure

Continue eating only low-fiber foods. Avoid foods with certain dyes that may interfere with the test.

Low-fiber food chart

One day before procedure

  • Drink only clear liquids or certain light-colored beverages. (See the clear liquid chart below.)

  • Do not eat solid foods.

  • You will drink half of the laxative drink today, starting in the late afternoon.

  • Mix your laxative drink and start drinking it, following the instructions below or a handout from the medical center.  (Do not follow the instructions on the bottle itself.) Start drinking the laxative between 4 p.m. and 7 p.m. (You will need up to 6 hours to complete the laxative drink and finish bowel movements.)

  • Do not use alcohol, marijuana, or other substances that could impair your thought process.

Drink at least 8 glasses of liquid the day before your colonoscopy (in addition  to the laxative drink)  to prevent dehydration. See examples of what liquids you may drink and what to avoid:

Clear liquid chart

Mixing the laxative drink

The laxative drink is a prescription and you may pick it up at a medical center or we can mail it to you. Follow the instructions below or what you receive from the Kaiser Permanente pharmacy. Don't follow the instructions on the bottle.

  • Fill the laxative container to half full. Shake well, and then finish filling to the top line.

  • Use flavoring packets (included with the laxative bottle) if needed. Try a little flavoring in a glass before mixing the packets with the entire bottle.

Drinking the laxative

  • Drink 8 ounces every 10 to 15 minutes. Try to drink quickly rather than sipping.

  • Drink half the laxative the evening before the procedure. This takes about 2 hours, drinking a glass every 10 to 15 minutes. Store the rest in the refrigerator until the morning of your procedure.


Day of the colonoscopy

If your procedure is in the morning, you may need to get up earlier than usual to finish drinking the laxative.

  • Drink the rest of the laxative 4 to 5 hours before you leave home for the procedure.  Drink about an 8 ounce glass every 10 to 15 minutes, the same as the previous evening.

  • You must finish drinking any other beverage at least 2 hours before your appointment time.  This means that you need to calculate what time you need to get up so you have time to finish the prep drink 4 to 5 hours before leaving home.

The other liquids you may drink are the same as you had the day before your procedure. See the clear liquid chart.

Remember, you can't drink anything for at least 2 hours before your procedure.

You must have someone to take you home after your colonoscopy and stay with you for at least two hours.

Do not use alcohol, marijuana, or other substances that could impair your thought process prior to your appointment.

Do not drink alcohol, drive a car, or sign legal documents until the day after your procedure.


After your procedure

You will receive discharge instructions from your nurse after the procedure, including an after-visit summary with the results.

If tissue was removed, you will get a letter or phone call within 10 days of your procedure with those results.

There is a very small risk of bleeding after a colonoscopy for up to two weeks. You should be within a two-hour drive of a medical center for two  weeks following your colonoscopy and avoid traveling outside of the United States during this time period.

Low-fiber diet for colonoscopy preparation

Three days before your colonoscopy, eat only low-fiber foods listed below.
Two days before, continue eating only low-fiber foods.

See the clear liquid chart for the day before, and day of, your colonoscopy.


Milk and dairy

OK to eat:

  • Milk

  • Cream

  • Hot chocolate

  • Buttermilk

  • Cheese, including cottage cheese

  • Yogurt

  • Sour cream

NO yogurt mixed with:

  • Nuts, seeds, granola

  • Fruit with skin or seeds (such as berries)


Bread and grains

OK to eat:

  • Breads and grains made with refined white flour (including rolls, muffins, bagels, pasta)

  • White rice

  • Plain crackers, such as Saltines

  • Low-fiber cereal (including puffed rice, cream of wheat, corn flakes)

NO whole grains or high-fiber:

  • Brown or wild rice

  • Whole grain bread, rolls, pasta, or crackers

  • Whole grain or high-fiber cereal (including granola, raisin bran, oatmeal)

  • Bread or cereal with nuts or seeds



OK to eat:

  • Chicken

  • Turkey

  • Lamb

  • Lean pork

  • Veal

  • Fish and seafood

  • Eggs

  • Tofu

NO tough meat with gristle


None allowed


  • Dried peas (including split or black-eyed)

  • Dried beans (including kidney, pinto, garbanzo⁄chickpea)

  • Lentils

  • Any other legume



OK to eat:

  • Fruit juice without pulp

  • Applesauce

  • Ripe cantaloupe and honeydew

  • Ripe, peeled apricots and peaches

  • Canned or cooked fruit without seeds or skin

NO seeds, skin, membranes;  or dried fruit:

  • Raw fruit with seeds, skin, or membranes (includes berries, pineapple, apples, oranges, watermelon)

  • Any cooked or canned fruit with seeds or skin

  • Raisins or other dried fruit



OK for some if cooked or canned:

  • Canned or cooked vegetables without skin or peel (includes peeled carrots, mushrooms, turnips, asparagus tips)

  • Potatoes without skin

  • Cucumbers without seeds or peel

NO raw, skin, seeds, peel; or certain other vegetables:

  • Corn

  • Potatoes with skin

  • Tomatoes

  • Cucumbers with seeds and peel

  • Cooked cabbage or Brussels sprouts

  • Green peas

  • Summer and winter squash

  • Lima beans

  • Onions

Nuts, nut butter, seeds


OK to eat:

  • Creamy (smooth) peanut or almond butter

NO nuts or seeds:

  • Nuts including peanuts, almonds, walnuts

  • Chunky nut butter

  • Seeds such as fennel, sesame, pumpkin, sunflower


Fats and oils

OK to eat:

  • Butter

  • Margarine

  • Vegetable and other oils

  • Mayonnaise

  • Salad dressings made without seeds or nuts

NO salad dressing made with seeds or nuts



OK to eat:

  • Broth, bouillon, consomme, and strained soups

  • Milk or cream-based soup, strained


  • Unstrained soups

  • Chili

  • Lentil soup

  • Dried bean soup

  • Corn soup

  • Pea soup



OK to eat:

  • Custard

  • Plain pudding

  • Ice cream

  • Sherbet or sorbet

  • Jell-O or gelatin without added fruit or red or purple dye

  • Cookies or cake made with white flour, prepared without seeds, dried fruit, or nuts


  • Coconut

  • Anything with seeds or nuts

  • Anything with added red or purple dye

  • Cookies or cakes made with whole grain flour, seeds, dried fruit, or nuts


Drinks or beverages

OK to eat:

  • Coffee

  • Tea

  • Hot chocolate or cocoa

  • Clear fruit drinks (no pulp)

  • Soda and other carbonated beverages

  • Ensure, Boost, or Enlive without added fiber


  • Fruit or vegetable juice with pulp

  • Beverages with red or purple dye



OK to eat:

  • Sugar

  • Salt

  • Jelly

  • Honey

  • Syrup

  • Lemon juice


  • Coconut

  • Popcorn

  • Jam

  • Marmalade

  • Relishes

  • Pickles

  • Olives

  • Stone-ground mustard

Clear-liquid diet for colonoscopy preparation

One day before — and the day of — your colonoscopy, you will be on a clear-liquid diet. The chart shows examples of drinks you can include, and what to avoid. Starting the day before your screening, don't eat any solid food until after your colonoscopy.

See the low-fiber diet chart for what you can eat the previous days.




  • Water

  • Tea and black coffee without any milk, cream, or lightener

  • Flavored water without red or purple dye

  • Clear, light colored juices such as apple, white grape, lemonade without pulp, and white cranberry

  • Clear broth including chicken, beef, or vegetable

  • Soda

  • Sports drinks such as Gatorade and Propel (light colors only)

  • Popsicles without fruit or cream; no red or purple dye

  • Jello-O or other gelatin without fruit; no red or purple dye

  • Boost Breeze Tropical Juice drink


  • Alcoholic beverages

  • Milk

  • Smoothies

  • Milkshakes

  • Cream

  • Orange juice

  • Grapefruit juice

  • Tomato juice

  • Soup (other than clear broth)

  • Cooked cereal

  • Juice, Popsicles, or gelatins with red or purple dye

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