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Serum/plasma concentration of nausea and vomiting frequency index (24-hour qualitative assessment)

Published: August 9, 2026Updated: August 16, 2026

This test evaluates how often you’ve experienced nausea and vomiting over the past 24 hours, using a qualitative approach to track symptoms.

Quick summary

["Helps doctors assess symptom burden and monitor treatment effectiveness."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
64713-1
Short code
Frequent nausea vomiting Mos PhenX
Synonyms
Frequent nausea vomiting Mos PhenX
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
phenx
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 This Test Measures

This test doesn’t measure specific chemicals or blood levels but instead records the frequency of nausea and vomiting episodes in the last 24 hours. It’s a qualitative assessment, meaning it categorizes symptoms rather than quantifying them numerically.

Why It’s Done

Your healthcare provider may order this test to monitor symptoms related to conditions like motion sickness, gastrointestinal disorders, or side effects from medications. It’s often used alongside other tests to guide treatment decisions.

How It’s Performed

No blood or other specimen is drawn for this test. Instead, you’ll likely be asked to report your nausea and vomiting frequency during a 24-hour period, often via a questionnaire or chart provided by your provider.

What to Expect Before the Test

No special preparation is needed. Simply track your symptoms as instructed, and bring the completed form to your appointment if required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps identify patterns in nausea and vomiting, which can indicate underlying issues such as food intolerances, infections, or neurological conditions. It also supports evaluating the success of treatments like anti-nausea medications or lifestyle adjustments.

Short name

Nausea/Vomiting Frequency Assessment

Frequently asked questions

What does a high or low result mean?
There are no specific numeric thresholds for this qualitative test. A higher frequency of symptoms may suggest worsening of a condition or inadequate treatment, while lower frequency could indicate improvement or resolution of the issue.
Does this test require fasting?
No fasting is required. This test focuses solely on symptom frequency and doesn’t involve blood or biochemical measurements.
Can I still eat or drink normally before this test?
Yes, you can eat and drink as usual. Since this is a symptom-tracking assessment, dietary restrictions don’t apply.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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