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408
XYLOSE-D, PLASMA 1 h
Method:
Molecular absorption Spectrometry.
Mounting:
Delivery period:4
Sample:
3 mL Plasma 60m Tripotassium EDTA Fluoride EDTA (2-8 ºC - Refrigerate)
Sample extraction:
We recommend performing a basal plasma extraction and voiding before ingesting xylose
Continue fasting for the duration of the test.
Patient preparation:
The patient should avoid taking acetylsalicylic acid, indomethacin, or atropine at least 24 hours before the test.
Reference V.:
> 2.00 mmol/L * 15 = mg/dL
409
XYLOSE-D, URINE
Method:
Molecular absorption Spectrometry.
Mounting:
Delivery period:4
Sample:
10 mL Urine (2-8 ºC - Refrigerate)
Sample extraction:
We recommend performing a basal plasma extraction and voiding before ingesting xylose
Collect all urine in the next 5 hours.
Continue fasting for the duration of the test.
Patient preparation:
The patient should avoid taking acetylsalicylic acid, indomethacin, or atropine at least 24 hours before the test.
Reference V.:
Excreción 5h:

5 g dose Both > 15 Years > 8.00 mmol/5h * 150 = mg/5h
25 g dose Both > 15 Years > 26.64 mmol/5h * 150 = mg/5h
R.Values:
In children, urine values ranging from 16 to 33% of the administered dose are observed.
Review:
14/05/2013
411
XYLOSE-D, PLASMA 2 h
Method:
Molecular absorption Spectrometry.
Mounting:
Delivery period:4
Sample:
3 mL Plasma 120m Tripotassium EDTA Fluoride EDTA (2-8 ºC - Refrigerate)
Sample extraction:
We recommend performing a basal plasma extraction and voiding before ingesting xylose
Continue fasting for the duration of the test.
Patient preparation:
The patient should avoid taking acetylsalicylic acid, indomethacin, or atropine at least 24 hours before the test.
Reference V.:

25 g dose > 1.67 mmol/L * 15 = mg/dL
5 g dose > 1.33 mmol/L * 15 = mg/dL
412
XYLOSE-D, PLASMA
Method:
Molecular absorption Spectrometry.
Mounting:
Delivery period:4
Sample:
3 mL Plasma Tripotassium EDTA Fluoride EDTA (2-8 ºC - Refrigerate)
Sample extraction:
We recommend performing a basal plasma extraction and voiding before ingesting xylose
Collect all urine in the next 5 hours.
Continue fasting for the duration of the test.
Patient preparation:
The patient should avoid taking acetylsalicylic acid, indomethacin, or atropine at least 24 hours before the test.
Reference V.:
Not available
Review:
17/05/2013
2209
XYLENE, BLOOD
Method:
Gas Chromatography.
Mounting:
Delivery period:16
Sample:
5 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
BEI:

End of workday < 14.13 umol/L * 0.106157 = mg/L
Review:
05/03/2004
2458
X-FRAGILE CHROMOSOME (FMR1 GENE), AMNIOTIC FLUID
Method:
PCR-Fragment length analysis+TP PCR.
Mounting:
Delivery period:17
Sample:
10 mL Amniotic fluid (12-20 ºC - Ambient Temp.)
Request form:
Clinical information required.
Sample extraction:
Use the tubes supplied by this laboratory.
Do not send specimen in the syringe.
Do not add formalin.
Reference V.:
Reported for each case
Review:
18/05/2013
8290
X-LINKED ICHTYOSIS (STS GENE: SEQUENCING), BLOOD
Method:
PCR-Sequencing.
Mounting:
Delivery period:65
Sample:
10 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
Request form:
Clinical information required.
Sample extraction:
Do not send specimens with heparin because they inhibit the polymerase of PCR.
Reference V.:
Reported for each case
Review:
18/05/2007
8984
XMRV VIRUS RNA, BIOLOGICAL FLUID
Method:
RT-PCR Nested.
Mounting:
Delivery period:10
Sample:
5 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
Sample extraction:
Do not send specimens with heparin because they inhibit the polymerase of PCR.
Reference V.:
Negative
Review:
28/05/2010
10605
X-LINKED ADRENOLEUCODYSTROPHIE (ABCD1 GENE: K. MUTATION), BLOOD
Method:
PCR-Sequencing.
Mounting:
Delivery period:35
Sample:
5 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
Request form:
Clinical information required.
Sample extraction:
Do not send specimens with heparin because they inhibit the polymerase of PCR.
Reference V.:
Reported for each case
10980
X-FRAGILE CHROMOSOME (FMR1 GENE), CHORIONIC VILLI
Method:
PCR-Fragment length analysis+TP PCR.
Mounting:
Delivery period:17
Sample:
10 mL Amniotic fluid (12-20 ºC - Ambient Temp.)
0.01 g Corial villus (12-20 ºC - Ambient Temp.)
Request form:
Clinical information required.
Sample extraction:
Use the tubes supplied by this laboratory.
Reference V.:
Reported for each case
11075
X-LINKED BRUTON AGAMMAGLOBULINEMIA (BTK GENE: SEQ.), BLOOD
Method:
PCR-Sequencing.
Mounting:
Delivery period:65
Sample:
10 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
Request form:
Clinical information required.
Sample extraction:
Do not send specimens with heparin because they inhibit the polymerase of PCR.
Reference V.:
Reported for each case
11599
XYLOSE INTOLERANCE TEST, EXPIRED AIR
Method:
Mass Spectrometry.
Mounting:
Delivery period:10
Sample:
1 Sample/s Post-baseline expired air 60 m (12-20 ºC - Ambient Temp.)
1 Sample/s Post-baseline expired air 90 m (12-20 ºC - Ambient Temp.)
1 Sample/s Post-baseline expired air 150 m (12-20 ºC - Ambient Temp.)
1 Sample/s Post-baseline expired air 180 m (2-8 ºC - Refrigerate)
1 Sample/s Post-baseline expired air 30 m (12-20 ºC - Ambient Temp.)
1 Sample/s Baseline expired air (12-20 ºC - Ambient Temp.)
1 Sample/s Post-baseline expired air (12-20 ºC - Ambient Temp.)
1 Sample/s Post-baseline expired air 120 m (12-20 ºC - Ambient Temp.)
Reference V.:
Reported for each case
14204
XENOBIOTICS METABOLISM (GSTT1 AND GSTM1 GENES), BLOOD
Method:
PCR-Sequencing.
Mounting:
Delivery period:35
Sample:
5 mL Total blood Tripotassium EDTA (2-8 ºC - Refrigerate)
Request form:
Clinical information required.
Sample extraction:
Do not send specimens with heparin because they inhibit the polymerase of PCR.
Reference V.:
Reported for each case
Review:
31/07/2014