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The Johns Hopkins Medical Institutions 
 
POINT-OF-CARE TESTING PROGRAM 
POLICIES AND PROCEDURES MANUAL 
Document 
Number: 
 
POC3-600 
Effective Date: 
 
2/17/09 
 
Title: 
 
Timing Device Calibration Check 
Page: 
 
Page 1 of 4 
Supercedes: 
 
10/15/06 
 
 
The Johns Hopkins Hospital 
Baltimore, Maryland 
Purpose This procedure provides instructions on how to validate the accuracy of readings obtained from 
timing devices. 
 
 
Frequency The accuracy of timing devices are validated  
  
 • Minimally,  twice a year 
 • When a timing device has been dropped 
 • When a new timing device is placed into service 
 
 
Materials  
Equipment Supplies 
•  Timing device(s) to be checked 
 
•  Website: 
 http://www.time.gov/timezone.cgi?Eastern/d/-5/java 
 
•  POC3-600F: Timing Device Calibration Check 
Logsheet  (Appendix B) 
 
 
 
 
Procedure  
Step Action 
1 On the Timing Device Calibration Check Logsheet, record: 
– Date 
– Tech ID 
– Manufacturer’s/timing device name 
– Serial Number of timing device to be checked 
– Location of where timing device is used 
– Point-of-Care (POC) Test(s) that use the timing device 
 
2 The accuracy of timing devices is checked at two time spans near the time(s) the device 
is used. 
      
Test Time(s) used Time Spans Validated 
Occult Blood 10 secs and  1 minute 10 secs and 5 minutes 
UrineDipstick- 
Multistix7, 
Multistix10SG 
30 secs to 2 minutes 10 secs and  5 minutes 
Urine Pregnancy 3 minutes 10 secs and  5 minutes 
Rapid HIV 20 minutes and 40 minutes 20 minutes and 40 minutes 
Hemoglobin 2 minutes 10 secs and 5 minutes 
Multiple POC Tests, 
excluding Rapid HIV 
10 secs to 3 minutes 10 secs and 5 minutes 
 
  
 
The Johns Hopkins Medical Institutions 
 
POINT-OF-CARE TESTING PROGRAM 
POLICIES AND PROCEDURES MANUAL 
Document 
Number: 
 
POC3-600 
Effective Date: 
 
2/17/09 
 
Title: 
 
Timing Device Calibration Check 
Page: 
 
Page 2 of 4 
Supercedes: 
 
10/15/06 
 
 
The Johns Hopkins Hospital 
Baltimore, Maryland 
Procedure 
(continued) 
Step Action 
3 Access the official United States Time Clock:  
http://www.time.gov/timezone.cgi?Eastern/d/-5/java. 
 
4 Record the projected  start time of the official U.S. Time Clock, displayed as hh:mm:ss.  
5 Record the designated stop time for the official U.S. Time Clock (hh:mm:ss). 
6 Press the start button of the timer to be checked at the projected start time of the U.S. 
Time Clock.  If using the POCT-issued SP brand timer, use the timer count-up mode. 
6 Visually stop the timing device when the official U.S. Time Clock reaches the first 
designated time span and then manually stop the timing device at the second designated 
time span. 
7 Record the observed time with units (seconds, minutes, etc.) of the timing device being 
checked. 
8 Acceptable limits are determined based on the reading accuracy of the timing device 
being tested and/or reference timer. 
9 Acceptable limits for the POCT-issued SP brand timer are: 
 
Time  Spans Validated Acceptable Difference 
10 secs   1 sec 
5 minutes   15 secs 
20 minutes   1 min. 
40 minutes   1 min. 
 
 
10 If outside the acceptable limits, repeat the timer validation process. 
11 If the repeat validation is still outside acceptable limits, replace the battery 
12 Repeat the validation process.  If still outside acceptable limits, remove the timer from 
service and place another validated timer into service. 
13 Document the corrective action steps taken in the comment section of the POC3-600F 
Timing Device Calibration Check Logsheet.  See Appendix A. 
 
 
 
Appendices Appendix  A POC3-600F:   Timing Device Calibration Check Logsheet - EXAMPLE 
 
  Appendix  B POC3-600F:   Timing Device Calibration Check Logsheet- Blank Form 
 
 
 
 
 
 
 
The Johns Hopkins Hospital 
Department of Pathology 
Core Laboratory 
Point-of-Care Testing Program Office 
 
 
POC3 – 600F:   Timing Device Calibration Check Logsheet 
 
Date Tech Timing 
Device 
Name 
Serial 
Number 
Location POC 
Test  
Time 
Interval 
Span 
Reference 
(Official 
U.S. Time) 
Reading 
Timing 
Device 
Reading 
Acceptable 
Difference 
Comments 
9/25/06 SKH SP 230227128 POCT CMSC SB-201 Rapid HIV 20 min 
Start: 
9:10:00 
Stop: 
9:30:00 
19min:59secs ±  1 min Acceptable 
9/25/06 
 SKH SP 230227128 
POCT 
CMSC SB-201 Rapid HIV 40 min 
Start: 
9:10:00 
Stop: 
9:50:00 
39min:58secs ±  1 min Acceptable 
 
9?27/06 SKH 
SP 
POCT 2 41445254 
POCT 
CMSC SB-201 Multiple 10 sec 
Start: 
9:24:10 
Stop: 
9:24:20 
10 secs ±  1 sec Acceptable 
9/27/06 
 SKH 
SP 
POCT 2 41445254 
POCT 
CMSC SB-201 Multiple 5 min 
Start: 
9:26:00 
Stop: 
9:31:00 
6 min ±  15 sec Failed 
9/27/06 
 SKH 
SP 
POCT 2 41445254 
POCT 
CMSC SB-201 Multiple 5 min 
Start: 
9:36:00 
Stop: 
9:41:00 
6 min ±  15 sec Repeat-Failed; New battery installed 
9/27/06 
 SKH 
SP 
POCT 2 41445254 
POCT 
CMSC SB-201 Multiple 5 min 
Start: 
9:44:00 
Stop: 
9:49:00 
6 min ±  15 sec 
Failed – Timer removed 
from service;  New timer 
(POCT-3) placed into 
service 
9/27/06 
 SKH 
SP 
POCT 3 41445256 
POCT 
CMSC SB-201 Multiple 10 sec 
Start: 
9:50;00 
Stop: 
9:50:10 
10 secs ±  1 sec Acceptable 
9/27/06 
 SKH 
SP 
POCT 3 41445256 
POCT 
CMSC SB-201 Multiple 5 min 
Start: 
9:55:00 
Stop: 
10:00:00 
4min:58secs ±  15 sec Acceptable 
Revision:  9/06 
APPENDIX   A
E
X
A
M
P
LE
The Johns Hopkins Hospital 
Department of Pathology 
Core Laboratory 
Point-of-Care Testing Program Office 
 
 
POC3 – 600F:   Timing Device Calibration Check Logsheet 
 
Date Tech Timing 
Device 
Name 
Serial 
Number 
Location POC 
Test  
Time 
Interval 
Span 
Reference 
(Official 
U.S. Time) 
Reading 
Timing 
Device 
Reading 
Acceptable 
Difference 
Comments 
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
 
 
      Start:  
Stop: 
 
   
       Start:  
Stop: 
 
   
Revision:  9/06 
  
 
The Johns Hopkins Medical Institutions 
 
POINT-OF-CARE TESTING PROGRAM 
POLICIES AND PROCEDURES MANUAL 
Document 
Number: 
 
POC3-600 
Effective Date: 
 
2/17/09 
 
Title: 
 
Timing Device Calibration Check 
Page: 
 
Page 3 of 4 
Supercedes: 
 
10/15/06 
 
 
The Johns Hopkins Hospital 
Baltimore, Maryland 
 
 
 
 
 
Name 
 
Signature 
 
Date 
                                                                               
 
Author: 
Sandra Humbertson, 
MT(ASCP) 
 
9/27/06 
 
Approvals: 
 
POCT Director: William Clarke, Ph D. William Clarke 9/28/06 
 
 
   
 
 
   
 
Issued:         
  
   9/29/06 
 
Effective:      10/15/06 
 
 
Revision Level Reviewed By: Review Date 
2/17/09 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
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