Hematology, coagulation disorder testing


The Division of Hematology (clinical hematology, coagulation and special hematology) in the Department of Pathology at Northwell Health provides full service laboratory hematology testing for all aspects of routine and reference hematology and coagulation disorders. Disruptions in the body's ability to control blood clotting are known as coagulation disorders. Controlling blood clotting is an essential function of the body designed to prevent blood loss. One of the most commonly known coagulation disorders is hemophilia.

The Division of Hematology also provides high-quality consultation services to North Shore University Hospital (NSUH) and Long Island Jewish Medical Center (LIJMC), as well as to the community hospitals and Monter Cancer Center. Consultations are also received from New York City, Nassau and Suffolk counties.


The staff and technologists in the laboratories are dedicated, highly skilled and experienced in routine hematology and coagulation testing, as well as special hematology and comprehensive coagulation testing.

Timely results


The hematology laboratories are in operation 24 hours a day, seven days a week including holidays. Our services include routine testing of hematologic disorders such as low blood count or anemia, evaluations for abnormal white blood cell diseases such as leukemia, and to aid in the diagnosis of infectious diseases such as meningitis. Some of the routine hematology testing includes:

  • CBC with differential
  • Screening for sickle cell disease
  • Erythrocyte sedimentation rate
  • Reticulocyte count
  • Cerebrospinal fluid cell count and differential
  • Other body fluids cell count and differential

Additional specialized tests are performed to evaluate other disorders of red blood cells and hemoglobin.


Routine coagulation disorders studies are available 24 hours a day, 7 days a week to screen for bleeding disorders such as hemophilia, to monitor treatment of clotting disorders and to evaluate for other coagulation disorders.

Some of the routine coagulation disorders tests include prothrombin time, INR (evaluation for anticoagulation), activated partial thromboplastin time, fibrinogen, and anti-factor Xa activity (to monitor heparin therapy given for abnormal clotting).

Special services

In addition, specialized testing for comprehensive evaluation of bleeding disorders (including platelet dysfunction) and clotting are available in the special coagulation laboratories at both Northwell Health Core Labs and Long Island Jewish Medical Center. This testing is performed Monday through Friday by a skilled technologist with special training in the diagnosis of coagulation disorders.

(800) 472-5757

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Northwell Health Labs offers comprehensive laboratory services 24 hours a day, 7 days a week.

Fax: (516) 719-1037


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