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Primary Contact Last Name (Patient Demographics)

Published: August 9, 2026Updated: August 17, 2026

This field records the last name of the primary contact associated with a patient or account. It is an administrative identifier, not a laboratory test.

Quick summary

["This is the surname of the main contact listed in the patient or account record."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
71753-8
Short code
PRIMARYCONTACTLASTNAME
Synonyms
—
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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?

Primary Contact Last Name is a demographic information field. It stores the surname of the person designated as the main contact and does not represent a blood, urine, or other specimen test.

Why might I need this test?

This information may be used to identify and communicate with the person responsible for a patient, account, service, or healthcare decision. It is also commonly used for record matching and administrative purposes.

How is the test performed?

There is no laboratory procedure involved. The information is entered or verified as part of registration, intake, or demographic record review.

How do I prepare for the test?

No preparation is needed. Have the correct surname of the primary contact available so it can be entered or confirmed accurately.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Primary Contact Last Name

Frequently asked questions

Is this a laboratory test?
No. It is an administrative field used to record the surname of a patient's primary contact.
Whose last name should be entered?
Enter the last name of the person designated as the primary contact, which may be the patient or another responsible person.
Why is it important to check this information?
Accurate information helps ensure that records are matched correctly and that the appropriate person receives communications. It does not provide any diagnostic information.
  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 17, 2026. · Read our editorial policy