OBJECTIVE: To establish a rapid differential diagnosis of hemoglobin (Hb) Queens and Hb Siam from other clinically relevant variants. DESIGN AND METHODS: Molecular and hematological features associated with two pregnant Thai women who were mistaken for Hb S were investigated. A simultaneous DNA diagnosis based on multiplex allele specific PCR approach was developed and tested with other common variants. RESULTS: Apart from mild anemia, the two subjects were generally healthy. DNA analysis identified that they were respectively carriers of Hb Siam [alpha15(A13)Gly-Arg] and Hb Queens [alpha34(B15)Leu-Arg]. A successful application of the multiplex allele specific PCR for differential diagnosis was demonstrated. CONCLUSION: Diagnosis of these clinically relevant hemoglobinopathies is problematic in the routine setting, and the method developed should prove useful in complementing routine Hb analysis for providing accurate diagnosis.
OBJECTIVE: To establish a rapid differential diagnosis of hemoglobin (Hb) Queens and Hb Siam from other clinically relevant variants. DESIGN AND METHODS: Molecular and hematological features associated with two pregnant Thai women who were mistaken for Hb S were investigated. A simultaneous DNA diagnosis based on multiplex allele specific PCR approach was developed and tested with other common variants. RESULTS: Apart from mild anemia, the two subjects were generally healthy. DNA analysis identified that they were respectively carriers of Hb Siam [alpha15(A13)Gly-Arg] and Hb Queens [alpha34(B15)Leu-Arg]. A successful application of the multiplex allele specific PCR for differential diagnosis was demonstrated. CONCLUSION: Diagnosis of these clinically relevant hemoglobinopathies is problematic in the routine setting, and the method developed should prove useful in complementing routine Hb analysis for providing accurate diagnosis.