Parks & Recreation. Join us for the first-ever Arlington Palooza, a free outdoor program for all ages with live music, art, games, and more on Saturday, April 29, 1-4 pm. at Alcova Heights Park. STEM Fun Fair: A one day expo, May 6, featuring hands on activities and exhibits that that showcases the diversity of the STEM fields and their applications to the real world. Native Plant Sale: Want to improve your yard for local birds and butterflies? Then it's time to Grow Native.
Reference Range. Partial thromboplastin time (PTT) and activated partial thromboplastin time (aPTT) are used to test for the same functions; however, in aPTT, an activator is added that speeds up the clotting time and results in a narrower reference range.he aPTT is considered a more sensitive version of the PTT and is used to monitor the patientâs response to heparin therapy. The reference range of the aPTT is 30-40 seconds. The reference range of the PTT is 60-70 seconds.
An AFQT percentile score indicates the percentage of examinees in a reference group that scored at or below that particular score. For current AFQT scores, the reference group is a sample of 18 to 23 year old youth who took the ASVAB as part of a national norming study conducted in 1997. Standard Score indicates how many units of the standard deviation a particular score is above or below the mean. In the case of the ASVAB subtests, the mean is set to 50 and the standard deviation is set to 10.