CBC with Differential / Platelets

CPT: 85025

Expected Turnaround Time

24 Hours

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Specimen Requirements


Whole Blood


EDTA (Lavender Top Tube)

Storage Instructions

Room Temp., Refrigerated (2-8 C)

Stability Requirements

Room temp. 48hrs., Refrigerated 48 hours

Test Details

Additional Information

A complete blood count (CBC) is a blood test that measures amounts and sizes of red blood cells, hemoglobin, white blood cells and platelets. It can be used to monitor and diagnose medical conditions and assess the health of the immune system. Infections, medications, anemia and cancer can cause abnormal results. 

A CBC test can be ordered with just total white blood cell counts or with a differential. A differential counts each different type of white blood cell and immature red blood cells. These might be shown as an absolute number of cells (written as “abs”) or a percentage (%) of all the white blood cells.  

A blood differential test measures the amount of each type of white blood cell (WBC) that is in the body. White blood cells (leukocytes) are part of the immune system, a network of cells, tissues, and organs that work together to protect the body from infection. There are five different types of white blood cells: 

  • Neutrophils are the most common type of white blood cell. They are the body’s main defense against infection when bacteria, viruses, or other germs enter the body. 
  • Lymphocytes include two main types of white blood cells: B cells and T cells. B cells fight off invading viruses, bacteria, or toxins. Certain T cells can target and destroy the body’s own cells, such as cancer cells and cells that have been infected by viruses. 
  • Monocytes kill bacteria, viruses, and other germs that may cause sickness. They also boost the body’s immune response and clear away dead cells. 
  • Eosinophils defend against parasites and infections. They are also involved in allergies and help control inflammation (swelling and redness). 
  • Basophils release enzymes during allergic reactions and asthma attacks. 


  1. Centers for Disease Control and Prevention [Internet]. Atlanta: U.S. Department of Health and Human Services; Preventing Infections in Cancer Patients; [reviewed 2021 Nov 16; cited 2021 Dec 16]; [about 2 screens]. Available from: https://www.cdc.gov/cancer/preventinfections/neutropenia.htm 

Statement on Medical Necessity
All ordered tests should be medically necessary for the diagnosis or detection of disease, illness, impairment, symptom, syndrome, or disorder and the results should be used in the medical management and treatment decisions for the patient. Solaris requires ICD-10 codes with each order for lab testing and both the tests ordered and the diagnosis should be documented in the provider’s medical record for the patient. The United States Department of Health and Human Services, Office of Inspector General, takes the position that a provider who orders medically unnecessary tests may be subject to civil penalties.

Panels and Profiles
Solaris offers Providers the convenience of ordering test combinations in a group at times with the flexibility to choose appropriate test(s) for individual patients. Providers should only order those tests that he or she believes are medically necessary for each patient, and a lesser inclusive profile or individual tests should be ordered if not all tests in the test combination/profile are medically necessary. All tests offered in a test combination/profile may be ordered separately as individual tests. Solaris encourages clients to contact their Solaris representative if the testing configurations shown do not meet individual needs for any reason, or if some other combination of procedures is needed.

CPT Codes
CPT Codes listed are in accordance with Current Procedural Terminology, a publication of the American Medical Association. CPT codes are the responsibility of the billing party and are listed here for informational purposes. Correct coding may vary from one carrier to another. Solaris may bill specific carriers using codes other than what is shown.


For questions or inquiries related to testing please reach out to
customerservice@solarisdx.com or contact us by phone at (844) 550-0308.