Name Sickle-cell trait
Type Disease or Syndrome
Group Haematological or immunological
Data Sources

Clinical Terminologies Read Version 2
Codelists kuan_sickle_trait_HpKeYNjMWk7CReFWYJUAZ8_Read2.csv kuan_sickle_trait_HpKeYNjMWk7CReFWYJUAZ8_ICD10.csv
Valid Event Data Range 01/01/1999 - 01/07/2016
Sex Female
Authors Kuan V, Denaxas S, Gonzalez-Izquierdo A, Direk K, Bhatti O, Husain S, Sutaria S, Hingorani M, Nitsch D, Parisinos C, Lumbers T, Mathur R, Sofat R, Casas JP, Wong I, Hemingway H, Hingorani A
Agreement Date 20 May 2019
Version (UUID) 1 (HpKeYNjMWk7CReFWYJUAZ8)

Primary care

Disease Readcode Medcode ReadcodeDescr Category
Sickle-cell trait 677C600 106623.0 Sickle cell gene carrier Diagnosis of Sickle-cell trait
Sickle-cell trait D105.00 3616.0 Sickle-cell trait Diagnosis of Sickle-cell trait

Secondary care


Disease ICD10code ICD10codeDescr Category
Sickle-cell trait D57.3 Sickle-cell trait Diagnosis of Sickle-cell trait


At the specified date, a patient is defined as having had Sickle-cell trait IF they meet the criteria for any of the following on or before the specified date. The earliest date on which the individual meets any of the following criteria on or before the specified date is defined as the first event date:

Primary care
1. Sickle-cell trait diagnosis or history of diagnosis during a consultation 
Secondary care (ICD10)
1. ALL diagnoses of Sickle-cell trait or history of diagnosis during a hospitalization


Kuan V., Denaxas S., Gonzalez-Izquierdo A. et al. A chronological map of 308 physical and mental health conditions from 4 million individuals in the National Health Service. The Lancet Digital Health - DOI 10.1016/S2589-7500(19)30012-3