GR Analyte, Serum/Plasma — Mass Concentration
Measures the concentration of a substance coded GR in serum or plasma. Because GR is not a standard analyte abbreviation, the exact substance should be confirmed with the laboratory.
["The GR code is not specific enough to identify the substance reliably, so confirm the exact test name with your healthcare provider or laboratory."]
Key facts at a glance
- LOINC
- 2329-1
- Short code
- GRP SerPl-mCnc
- Synonyms
- GRP SerPl-mCnc
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
This test measures the amount of a substance per unit volume of blood serum or plasma. The abbreviation GR is not a widely standardized name for an analyte, so the laboratory report or order should be checked to identify the exact substance being measured.
Why might I need this test?
A serum or plasma concentration may be used to evaluate a suspected illness, monitor treatment or medication effects, or assess a change in body chemistry. The reason for testing depends on the substance identified by the laboratory.
How is the test performed?
A blood sample is collected, and the liquid portion of the blood is separated for analysis. The laboratory then measures how much of the specified substance is present in a given volume of serum or plasma.
How do I prepare for the test?
Follow the preparation instructions provided with the test order. Unless your clinician specifically says otherwise, do not fast; some substances are affected by recent meals, exercise, medications, or fluid intake.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An elevated or decreased concentration can reflect an underlying condition, medication effects, or temporary changes such as hydration status or recent food intake. The meaning of an abnormal result depends on the exact substance, the clinical situation, and the laboratory's reference interval. Confirm the analyte name and discuss the result with your healthcare provider.
Short name
Serum/Plasma Mass Concentration
Frequently asked questions
What substance does GR refer to?
Do I need to fast for this test?
What does an abnormal result mean?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy