Incomplete T2 screens T2 screens do not require an NT scan, just a blood sample, but may be incomplete if missing dating information or weight, if the sample is taken later than 20 weeks of pregnancy, or if the sample is damaged and not repeated. For 2015, 4% of T2 commenced screens were incomplete, compared with 10% of T1 commenced screens. As Table 17 shows, the percentage of incomplete T2 screens decreased from 5% in 2011 to 3% in 2014, before increasing to 4% in 2015. 17: Incomplete T2 screens, January 2011 to December 2015 Year Commenced second trimester No result issued Percentage incomplete 4,690 244 5.2 2011 5,230 273 5.5 2012 5,487 218 4.1 2013 5,613 157 2.9 2014 5,732 224 4.1 2015 Incomplete T2 screens by DHB Table 18 shows a breakdown of incomplete T2 screens by DHB for the 2015 year. The very low numbers involved limit meaningful DHB comparisons. Table 18: IncompleteT2 screens by DHB, January 2015 to December 2015 DHB Commenced second trimester No result issued Percentage incomplete 164 5 3.0 Northland 737 27 3.7 Waitemata 615 28 4.6 Auckland 1,178 46 3.9 Counties Manukau 459 19 4.1 Waikato 113 2 1.8 Lakes 176 7 4.0 Bay of Plenty 70 2 2.9 Tairawhiti 153 9 5.9 Hawke’s Bay 189 7 3.7 Taranaki 149 5 3.4 MidCentral 85 3 3.5 Whanganui 291 14 4.8 Capital and Coast 197 7 3.6 Hutt Valley 44 3 6.8 Wairarapa 111 5 4.5 Nelson Marlborough 36 2 5.6 West Coast 609 26 4.3 Canterbury Canterbury 88 - 0.0 Southern 268 7 2.6 Total 5,732 224 3.9
Incomplete T2 screens T2 screens do not require an NT scan, just a blood sample, but may be incomplete if missing dating information or weight, if the sample is taken later than 20 weeks of pregnancy, or if the sample is damaged and not repeated. For 2015, 4% of T2 commenced screens were incomplete, compared with 10% of T1 commenced screens. As Table 17 shows, the percentage of incomplete T2 screens decreased from 5% in 2011 to 3% in 2014, before increasing to 4% in 2015. 17: Incomplete T2 screens, January 2011 to December 2015 Year Commenced second trimester No result issued Percentage incomplete 2011 4,690 244 5.2 2012 5,230 273 5.5 2013 5,487 218 4.1 2014 5,613 157 2.9 2015 5,732 224 4.1 Incomplete T2 screens by DHB Table 18 shows a breakdown of incomplete T2 screens by DHB for the 2015 year. The very low numbers involved limit meaningful DHB comparisons. Table 18: IncompleteT2 screens by DHB, January 2015 to December 2015 DHB Commenced second trimester No result issued Percentage incomplete Northland 164 5 3.0 Waitemata 737 27 3.7 Auckland 615 28 4.6 Counties Manukau 1,178 46 3.9 Waikato 459 19 4.1 Lakes 113 2 1.8 Bay of Plenty 176 7 4.0 Tairawhiti 70 2 2.9 Hawke’s Bay 153 9 5.9 Taranaki 189 7 3.7 MidCentral 149 5 3.4 Whanganui 85 3 3.5 Capital and Coast 291 14 4.8 Hutt Valley 197 7 3.6 Wairarapa 44 3 6.8 Nelson Marlborough 111 5 4.5 West Coast 36 2 5.6 Canterbury 609 26 4.3 Canterbury 88 - 0.0 Southern 268 7 2.6 Total 5,732 224 3.9