Urine C-Peptide

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Collecting a urine sample for C-Peptide / Creatinine ratio

This test is used to check the levels of insulin naturally produced in your body. The page is for urine c-peptide testing, blood testing information can be found here

Collect the sample Monday or Tuesday after breakfast or lunch. Wednesday after breakfast. It needs to be dropped at the surgery on the same day, before 3pm.

Instructions

  1. Empty your bladder into the toilet.
  2. If you inject insulin, take it as you normally would.
  3. Eat a high carbohydrate meal, several pieces of toast with fruit juice.
  4. After, do not eat or drink anything apart from water for 2 hours until you have taken the urine sample. However, if you feel your blood sugar is low, you must treat this and do the test another day.
  5. Approximately 2 hours after this meal, empty your bladder again and collect a sample of this urine as detailed below.

Do not take this sample whilst you are menstruating.

To collect your urine sample

  1. Pass your urine into the plastic pot and transfer to the white top specimen tube (or use a green container if provided with this already).
  2. Write your full name, date of birth, hospital or NHS number and the time and date of the collection on the tube.
  3. Place the specimen tube and request form into the bag provided.

After you have collected the sample

  1. Bring the sample to the Burdwood Surgery as soon as it has been collected, this needs to be before 3pm.
  2. Place the sample in the sample box which is located by the toilets near reception.

If you need help with this, please contact us online

More Information

Lab Tests Online