    <SEC-DOCUMENT>0001104659-25-119341-index.html : 20251208
    <SEC-HEADER>0001104659-25-119341.hdr.sgml : 20251208
    <ACCEPTANCE-DATETIME>20251208165233
    ACCESSION NUMBER:		0001104659-25-119341
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		14
    CONFORMED PERIOD OF REPORT:	20250930
    FILED AS OF DATE:		20251208
    DATE AS OF CHANGE:		20251208
    EFFECTIVENESS DATE:		20251208

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			abrdn Life Sciences Investors
    		CENTRAL INDEX KEY:			0000884121
    		ORGANIZATION NAME:
    		EIN:				043147016
    		STATE OF INCORPORATION:			MA
    		FISCAL YEAR END:			0930

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-06565
    		FILM NUMBER:		251556735

    	BUSINESS ADDRESS:
    		STREET 1:		1900 MARKET STREET
    		STREET 2:		SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103
    		BUSINESS PHONE:		6177728515

    	MAIL ADDRESS:
    		STREET 1:		1900 MARKET STREET
    		STREET 2:		SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TEKLA LIFE SCIENCES INVESTORS
    		DATE OF NAME CHANGE:	20141015

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	H&Q LIFE SCIENCES INVESTORS
    		DATE OF NAME CHANGE:	19920929
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>tm2527059d12_ncsr.htm
    <DESCRIPTION>N-CSR
    <TEXT>
    Document 1 - file: tm2527059d12_ncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CODEETH
    <SEQUENCE>2
    <FILENAME>tm2527059d12_ex99-codeeth.htm
    <DESCRIPTION>EXHIBIT 99.CODEETH
    <TEXT>
    Document 2 - file: tm2527059d12_ex99-codeeth.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>3
    <FILENAME>tm2527059d12_ex99-cert.htm
    <DESCRIPTION>EXHIBIT 99.CERT
    <TEXT>
    Document 3 - file: tm2527059d12_ex99-cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>4
    <FILENAME>tm2527059d12_ex99-906cert.htm
    <DESCRIPTION>EXHIBIT 99.906CERT
    <TEXT>
    Document 4 - file: tm2527059d12_ex99-906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(C)(1)
    <SEQUENCE>5
    <FILENAME>tm2527059d12_ex99-xcx1.htm
    <DESCRIPTION>EXHIBIT 99.(C)(1)
    <TEXT>
    Document 5 - file: tm2527059d12_ex99-xcx1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(C)(2)
    <SEQUENCE>6
    <FILENAME>tm2527059d12_ex99-xcx2.htm
    <DESCRIPTION>EXHIBIT 99.(C)(2)
    <TEXT>
    Document 6 - file: tm2527059d12_ex99-xcx2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(D)
    <SEQUENCE>7
    <FILENAME>tm2527059d12_ex99-xd.htm
    <DESCRIPTION>EXHIBIT 99.(D)
    <TEXT>
    Document 7 - file: tm2527059d12_ex99-xd.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(E)
    <SEQUENCE>8
    <FILENAME>tm2527059d12_ex99-xe.htm
    <DESCRIPTION>EXHIBIT 99.(E)
    <TEXT>
    Document 8 - file: tm2527059d12_ex99-xe.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2527059d12hqlreporti001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2527059d12hqlreporti001.gif

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>tm2527059d12hqlreporti002.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: tm2527059d12hqlreporti002.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>tm2527059d12hqlreporti003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: tm2527059d12hqlreporti003.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>tm2527059d12hqlreporti004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: tm2527059d12hqlreporti004.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>tm2527059d12hqlreporti005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: tm2527059d12hqlreporti005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>tm2527059d12_ex99-xcx1img01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: tm2527059d12_ex99-xcx1img01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>