CPT® Code 82128

Official Description

Amino acids; multiple, qualitative, each specimen

Common Language Description

The CPT® Code 82128 refers to a laboratory test that is designed to detect the presence of multiple amino acids in a specimen, which can be either blood or urine. Amino acids are essential organic compounds that serve as the building blocks of proteins and play a critical role in various metabolic processes within the body. This test is particularly relevant for individuals suspected of having an inborn error of metabolism, a group of genetic disorders that disrupt normal metabolic pathways. The clinical manifestations of these disorders often present in infancy or early childhood and can vary significantly based on the specific amino acid that is affected. Symptoms may include feeding difficulties, poor growth or failure to thrive, seizures, muscle weakness, renal or liver dysfunction, developmental delays, and cognitive impairments. To perform the test, a blood sample is typically collected through venipuncture, which is a procedure that involves puncturing a vein to obtain blood. Alternatively, a urine sample can be collected either through a voided specimen or via catheterization, depending on the clinical scenario. The analysis of the samples is conducted using advanced techniques such as liquid chromatography-tandem mass spectrometry, which allows for precise identification and quantification of amino acids. It is important to note that if the test is specifically measuring the quantitative amount of a single amino acid, the appropriate code to report would be CPT® Code 82131. Quantitative amino acid testing is particularly useful for monitoring treatment and dietary compliance in patients with conditions such as phenylketonuria (PKU), cystinuria, and Hartnup disease, which are all disorders related to amino acid metabolism.

1. Indications

The CPT® Code 82128 is indicated for use in the following clinical scenarios:

Inborn Errors of Metabolism This test is performed when there is a suspicion of an inborn error of metabolism, which may present with various symptoms in infants or young children.
Feeding Problems The test may be indicated in cases where the patient exhibits feeding difficulties, which can be a sign of metabolic disorders.
Failure to Thrive It is also indicated for patients who are not growing adequately or are experiencing failure to thrive, as this may suggest underlying metabolic issues.
Neurological Symptoms The presence of seizures or developmental delays may warrant this test to rule out metabolic causes.
Muscle Weakness Muscle weakness in a patient can be an indication for testing to identify potential metabolic disorders affecting amino acid metabolism.
Renal or Liver Dysfunction The test may be indicated in patients showing signs of renal or liver failure, as these organs play a crucial role in amino acid metabolism.
Cognitive Deficits Cognitive impairments in children may also prompt testing for amino acid levels to investigate possible metabolic disorders.

2. Procedure

The procedure for conducting the amino acids test under CPT® Code 82128 involves several key steps:

Sample Collection A blood sample is obtained through venipuncture, which involves inserting a needle into a vein to draw blood. Alternatively, a urine sample can be collected either by having the patient void into a container or through catheterization, depending on the clinical requirements.
Sample Preparation Once the samples are collected, they are prepared for analysis. This may involve processing the blood to separate serum or plasma, as well as preparing the urine sample for testing.
Testing Methodology The prepared samples are then analyzed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). This advanced analytical technique allows for the precise identification and quantification of multiple amino acids present in the specimens.
Result Interpretation After the analysis is complete, the results are interpreted by qualified laboratory personnel. The presence of abnormal levels of specific amino acids can indicate potential metabolic disorders.
Reporting Finally, the results are compiled into a report, which is then communicated to the healthcare provider for further evaluation and management of the patient’s condition.

3. Post-Procedure

Post-procedure care for patients undergoing the amino acids test typically involves monitoring for any immediate complications related to blood draw, such as bruising or discomfort at the venipuncture site. Patients may be advised to hydrate adequately, especially if a urine sample was collected. The healthcare provider will review the test results once they are available, which may take several days, and discuss any necessary follow-up actions based on the findings. If abnormal amino acid levels are detected, further diagnostic testing or referrals to specialists may be warranted to address any underlying metabolic disorders.

Short Descr	AMINO ACIDS MULT QUAL
Medium Descr	AMINO ACIDS MULTIPLE QUALITATIVE EACH SPECIMEN
Long Descr	Amino acids; multiple, qualitative, each specimen
Status Code	Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days	XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC)	9 - Not Applicable
Multiple Procedures (51)	9 - Concept does not apply.
Bilateral Surgery (50)	9 - Concept does not apply.
Physician Supervisions	09 - Concept does not apply.
Assistant Surgeon (80, 82)	9 - Concept does not apply.
Co-Surgeons (62)	9 - Concept does not apply.
Team Surgery (66)	9 - Concept does not apply.
Diagnostic Imaging Family	99 - Concept Does Not Apply
CLIA Waived (QW)	No
APC Status Indicator	Conditionally packaged laboratory tests
Type of Service (TOS)	5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS)	T1H - Lab tests - other (non-Medicare fee schedule)
MUE	2
CCS Clinical Classification	206 - Microscopic examination (bacterial smear, culture, toxicology)

90	Reference (outside) laboratory: when laboratory procedures are performed by a party other than the treating or reporting physician or other qualified health care professional, the procedure may be identified by adding modifier 90 to the usual procedure number.