C-Peptide
Quest Diagnostics
Sample type: Serum
Requires fasting: Yes
Phlebotomy required
Details
This test is crucial for understanding how well the pancreas' beta cells are working. It's especially helpful for distinguishing between type 1 and type 2 diabetes, monitoring the health of pancreatic or islet cell transplants, and identifying the cause of low blood sugar due to high insulin levels. This could mean finding out whether the body is producing too much insulin on its own or if insulin is being introduced from outside the body. Additionally, the C-Peptide test is more reliable than direct insulin measurements for certain assessments because it's less affected by blood sample handling.
- C-Peptide
Estimated days for results: Results should be available in 2 - 5 business days after the sample is collected
This test is crucial for understanding how well the pancreas' beta cells are working. It's especially helpful for distinguishing between type 1 and type 2 diabetes, monitoring the health of pancreatic or islet cell transplants, and identifying the cause of low blood sugar due to high insulin levels. This could mean finding out whether the body is producing too much insulin on its own or if insulin is being introduced from outside the body. Additionally, the C-Peptide test is more reliable than direct insulin measurements for certain assessments because it's less affected by blood sample handling.
- Show symptoms of having either type 1 or type 2 diabetes.
- Have received pancreatic or islet cell transplants.
- Experience episodes of low blood sugar that suggest unusually high insulin levels.
What type of sample is required for this test?
A blood draw is necessary.
3–5 business days
- Fasting before a blood draw means you don't eat or drink anything except water.
- Your doctor should provide any special instructions related to fasting for your test. Always follow your doctor's instructions.
Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:
Quest Diagnostics Patient Service Centers (PSC)
- Location: Visit a nearby Quest Diagnostics Patient Service Center.
- Cost: $10 sample collection fee (paid during lab order checkout).
- Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 10 minutes before your appointment.
- Collection Instructions:
- Bring a valid ID.
- Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.
- Check-in: Scan the QR code from your confirmation email or follow kiosk instructions.
- More Info: Quest Diagnostics blood draw guide
Getlabs Mobile Phlebotomy
- Location: Sample collection at your home or office.
- Cost: $85 sample collection fee (paid during lab order checkout).
- Availability: Available in most locations – enter your ZIP code during checkout to confirm.
- Scheduling: Schedule your appointment here through your Fullscript account.
- Collection Instructions:
- Have your digital or printed requisition form and valid ID ready.
- Your phlebotomist will contact you by phone to coordinate arrival.
- More Info: Getlabs blood draw guide
- Preferred Specimen(s): 1 mL serum
- Alternative: NA
- Minimum Volume: 0.5 mL
- Collection Instructions: NA
- Transport Container: Transport tube
- Transport Temperature: Room Temperature
- Specimen Stability:
- Room temperature: 4 days
- Refrigerated: 7 days
- Frozen: 7 days
- Reject Criteria:
- Gross hemolysis • Plasma
State restrictions:
Patient can't order this test if they are located in Hawaii, Puerto Rico, New Jersey, New York, or Rhode Island
