EX-12.1

											EXHIBIT 12.1
STATEMENT OF COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES
(dollars in millions, except ratio information)
	Fiscal Years Ended December 31,										Nine Months Ended September 30,
	2005		2006		2007		2008		2009		2010
Income from continuing operations
before income taxes		640.7		720.9		802.3		785.7		884.6		699.7
Fixed Charges:
Interest on long-term and
short-term debt including
amortization of debt expense		34.4		47.8		56.6		72.0		62.9		50.7
Portion of rental expense as can be
demonstrated to be representative
of the interest factor		39.9		43.6		53.0		58.4		61.0		49.6
Total fixed charges		74.3		91.4		109.6		130.4		123.9		100.3
Earnings before income taxes and
fixed charges		715.0		812.3		911.9		916.1		1,008.5		800.0
Ratio of earnings to fixed charges		9.62		8.89		8.32		7.03		8.14		7.98

EX-31.1

Exhibit 31.1

Certification

I, David P. King, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Laboratory Corporation of America Holdings;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;  and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2010
	By:	/s/ DAVID P. KING
		David P. King
		Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification

I, William B. Hayes, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Laboratory Corporation of America Holdings;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;  and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2010
	By:	/s/ WILLIAM B. HAYES
		William B. Hayes
		Chief Financial Officer
		(Principal Financial Officer)

EX-32

Exhibit 32

Written Statement of

Chief Executive Officer and Chief Financial Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

     The undersigned, the Chief Executive Officer and the Chief Financial Officer of Laboratory Corporation of America Holdings (the “Company”), each hereby certifies that, to his knowledge on the date hereof:

     (a)  the Form 10-Q of the Company for the Period Ended September 30, 2010 filed on the date hereof with the Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

     (b)  information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ DAVID P. KING
	David P. King
	Chief Executive Officer
	November 1, 2010

By:	/s/ WILLIAM B. HAYES
	William B. Hayes
	Chief Financial Officer
	November 1, 2010