Summary & Overview
CPT 0305U: Ektacytometry for Red Blood Cell Deformability
CPT code 0305U designates a Proprietary Laboratory Analyses (PLA) test for Ektacytometry performed by BioChip Labs™. The assay evaluates red blood cell deformability using a whole blood specimen and measures elongation under shear stress. As a PLA code, 0305U is specific to one manufacturer's unique test and signals a specialized diagnostic service in hematology.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise national overview of the code’s clinical context, how it fits into laboratory service lines, and which major payers recognize the test for coverage considerations. The publication outlines expected sites of service and service type for coding and billing workflows and summarizes common modifiers associated with laboratory procedures.
The report provides benchmarks and payer coverage patterns, highlights policy implications for proprietary laboratory tests, and situates CPT code 0305U within diagnostic testing pathways for disorders affecting red blood cell deformability. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 0305U is a Proprietary Laboratory Analyses (PLA) code that applies exclusively to a single, manufacturer-specific test: Ektacytometry from BioChip Labs™. The assay uses a whole blood specimen to evaluate red blood cell (RBC) deformability, measuring elongation of RBCs under shear stress (force parallel to the cell surface).
Service Type: Laboratory — specialized hematology diagnostic test
Typical Site of Service: Clinical laboratory or reference diagnostic laboratory
Clinical & Coding Specifications
Clinical Context
A 12-year-old child with chronic hemolytic anemia is evaluated for red blood cell membrane disorders after intermittent jaundice, episodic splenomegaly, and a family history of hereditary spherocytosis. The hematologist orders an ektacytometry assay to assess RBC deformability using a whole blood specimen sent to BioChip Labs™. The specimen is collected in an appropriate anticoagulant tube, labeled, and shipped per the laboratory’s instructions. Results report RBC elongation indices across shear stresses to help distinguish membrane and cytoskeletal defects (for example, hereditary spherocytosis, hereditary elliptocytosis, and other congenital hemolytic anemias) from other causes of hemolysis. The clinical workflow includes: ordering the proprietary test (0305U) in the electronic medical record; obtaining informed consent if required; phlebotomy in an outpatient clinic, inpatient ward, or specialty hematology clinic; specimen packaging and shipment to BioChip Labs™; laboratory analysis by ektacytometry; and return of a diagnostic report to the ordering hematologist for correlation with peripheral smear, osmotic fragility tests, molecular testing, and clinical findings.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component if split billing applies. |
52 | Reduced services | Use when the test is partially completed or performed at a reduced level.
53 | Discontinued procedure | Use when the specimen collection or testing is started but discontinued for patient safety or other valid clinical reasons.
62 | Two surgeons | Use when two qualified practitioners share primary responsibility for complex specimen procurement or patient management related to testing (rare for this lab test).
78 | Return to operating room following surgery | Use when an unplanned return to the OR occurs and additional perioperative testing tied to that event is billed.
80 | Assistant surgeon | Use when a surgical assistant performs services related to specimen acquisition in the operative setting.
82 | Assistant surgeon (when qualified resident surgeon not available) | Use when a qualified assistant is required and no resident is available.
QK | Medical direction of two or more providers | Use when a physician medically directs two or more non-physician practitioners performing related services.
QX | Modifier for provider-specific supervision by a physician (modifier QX) | Use when a non-physician practitioner performs services under the physician’s supervision per payer rules.
QY | Medical direction of one physician by another physician | Use when one physician supervises a single auxiliary provider performing related services.
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207RH0000X | Hematology | Hematologists commonly order and interpret ektacytometry for hemolytic anemia evaluation. |
2080P0207X | Pediatric Hematology-Oncology | Pediatric hematologists manage congenital hemolytic anemias and coordinate specialized lab testing.
207K00000X | Clinical Pathology | Pathologists may oversee laboratory testing, quality, and interpretation of specialized assays.
363L00000X | Clinical Laboratory Services | Certified clinical laboratory directors manage specimen handling and testing workflows.
201Q00000X | Internal Medicine | Internists may initiate testing in adult patients with unexplained hemolysis.
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
D55.0 | Anemia due to glucose-6-phosphate dehydrogenase [G6PD] deficiency | G6PD deficiency can cause hemolysis; ektacytometry helps differentiate membrane defects from enzymatic hemolysis. |
D57.0 | Sickle-cell anemia with crisis | Hemoglobinopathy causing RBC deformability changes; ektacytometry can assess RBC mechanical properties.
D58.0 | Hereditary spherocytosis | Directly related — ektacytometry detects reduced RBC deformability characteristic of membrane disorders.
D58.1 | Hereditary elliptocytosis | Ektacytometry aids in identifying elliptocytosis by characteristic elongation index patterns.
D59.9 | Hemolytic anemia, unspecified | Used when hemolysis is present but etiology pending; ektacytometry contributes to diagnostic workup.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
0305U | Ektacytometry (BioChip Labs™) — proprietary PLA code for RBC deformation testing using whole blood | Primary code for the ektacytometry assay performed by BioChip Labs™; used to report the specialized laboratory analysis of RBC deformability. |
85025 | Blood count; automated differential WBC with platelet count | Often ordered concurrently to evaluate anemia severity, RBC indices, and white cell parameters.
85014 | Blood count; automated platelet count | May be ordered alongside CBC to assess platelet status in hematologic evaluation.
85390 | Erythrocyte sedimentation rate | Ordered in differential diagnosis when inflammatory causes are considered; sometimes included in broader hematology workup.
84443 | Assay of serum thyroid stimulating hormone (TSH) | Included when evaluating non-hematologic contributors to anemia (for example, hypothyroidism) as part of differential diagnosis.