Kidney
Protein and Creatinine Urine Test Blood Test Preparation: Fasting
- Urine sample
- Kidney
- Prep checklist included
At a glance
Protein and Creatinine Urine Test Blood Test: prep snapshot
- Sample type
- Urine sample
- Fasting
- Fasting is usually not required for a random urine protein and creatinine test, though a…
- Best collection time
- A random urine sample can be collected at any time of day.
- Typical turnaround
- Varies by collection lab
- Category
- Kidney
This page explains how to prepare for a Protein and Creatinine Urine Test, what the test measures, and what to confirm with the collection lab. The protein and creatinine urine test, random, checks a single urine sample for both protein and creatinine.
What the Protein and Creatinine Urine Test measures
It measures the amount of protein and the amount of creatinine present in one urine sample. Some laboratories also report a protein-to-creatinine ratio calculated from those two values.
- Protein
- Creatinine
- Protein-to-creatinine ratio
Preparation checklist for the Protein and Creatinine Urine Test
Routine random urine testing rarely requires special preparation. Your collection lab can confirm any timing, hydration, or fasting details when you book.
- Confirm with the collection lab whether any timing or fasting instructions apply to your order.
- Drink fluids as you normally would unless the lab tells you otherwise.
- Ask the lab whether they prefer a midstream clean-catch collection.
- Have your test order or requisition form ready before you arrive.
- Tell the lab about any current medications if they ask.
Fasting, timing, sample type, and what to bring
Fasting
Fasting is usually not required for a random urine protein and creatinine test, though a provider may request it if other tests are drawn at the same visit; confirm with your lab.
Best time to collect
A random urine sample can be collected at any time of day. Many people find it easiest to give the sample during a scheduled lab visit rather than storing it at home.
Sample type
Urine sample. The collector will explain the process before starting.
What to bring
- Your printed lab order or requisition form — the ordering physician prepares it for you after you order, and you print it (or fax it from your account) before visiting
- Your order confirmation email, in case the collection site asks to see it
- Water to drink before the draw and a light snack for afterward, if your test requires fasting
- A government-issued photo ID (most collection sites verify identity at check-in)
- A written list of the medications and supplements you currently take
- A short-sleeved or loose-sleeved shirt for an easy blood draw
You do not need an insurance card or a payment method at the collection site: the lab does not bill insurance, and you pay at order time, so there is no copay or deductible. The lab also provides the physician's requisition, so you do not need a separate doctor's referral.
Order process and what-to-bring details reflect the lab's published instructions, paraphrased in our own words. Confirm final requirements with the collection lab that will perform your draw.
At the collection site
You provide a urine sample in a private collection area, typically into a cup using a clean-catch method. The sample is labeled and sent to the lab, and the visit usually takes only a few minutes.
Details worth confirming with the collection lab before your visit:
- Does my order require fasting or a specific collection time?
- Do you prefer a midstream clean-catch sample for this test?
- How and when will my results be released to me or my clinician?
When this test is useful
A clinician may order this test to screen for kidney problems or to monitor a known kidney condition. It can also help evaluate protein loss when other symptoms or conditions raise concern.
Understanding your results
Reference ranges and reporting formats for protein and creatinine vary between laboratories. Your clinician interprets your result against the range provided by the lab that processed it.
General test information is compiled from publicly available reference material, including MedlinePlus (medlineplus.gov) and the Centers for Disease Control and Prevention (cdc.gov), and is reviewed for clarity. Preparation and what-to-bring details reflect the lab's published instructions, paraphrased into our own words. Preparation instructions, timing, and pricing vary by collection lab — always confirm them with the lab that will perform your draw.
Common questions
Frequently asked questions
Do I need to fast for this test?
Fasting is usually not necessary for a random urine protein and creatinine test. Confirm any fasting requirement with your collection lab or ordering provider.
Can I collect the sample at home?
This is a random spot sample, so some labs allow collection at home with a provided container. Ask your lab about their preferred process and drop-off timing.
How long do results take?
Turnaround is typically one to three business days, though it can vary by lab. Check with your collection site for their expected timeline.
Does what I drink or eat affect the result?
Hydration and diet can influence urine concentration, which is part of why protein is compared with creatinine. Follow any instructions your lab provides.